Allow using old ender pearl behavior & apply ender pearl exploit patch (#11524)

When enabled, ender pearls will not load chunks and will save to the world instead of the player.

Also changes the exploit config to be default false, as it only makes sense when legacy behavior is enabled.

patches/server/Allow-using-old-ender-pearl-behavior.patch

@@ -0,0 +1,62 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Jason Penilla <11360596+jpenilla@users.noreply.github.com>
+Date: Sun, 27 Oct 2024 12:36:53 -0700
+Subject: [PATCH] Allow using old ender pearl behavior
+
+When enabled, ender pearls will not load chunks and will save to the world instead of the player.
+
+== AT ==
+public net.minecraft.world.entity.projectile.Projectile cachedOwner
+
+diff --git a/src/main/java/net/minecraft/server/level/ServerPlayer.java b/src/main/java/net/minecraft/server/level/ServerPlayer.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/server/level/ServerPlayer.java
++++ b/src/main/java/net/minecraft/server/level/ServerPlayer.java
+@@ -0,0 +0,0 @@ public class ServerPlayer extends net.minecraft.world.entity.player.Player imple
+ 
+             while (iterator.hasNext()) {
+                 ThrownEnderpearl entityenderpearl = (ThrownEnderpearl) iterator.next();
++                if (entityenderpearl.level().paperConfig().misc.legacyEnderPearlBehavior) continue; // Paper - Allow using old ender pearl behavior
+ 
+                 if (entityenderpearl.isRemoved()) {
+                     ServerPlayer.LOGGER.warn("Trying to save removed ender pearl, skipping");
+@@ -0,0 +0,0 @@ public class ServerPlayer extends net.minecraft.world.entity.player.Player imple
+     }
+ 
+     public static long placeEnderPearlTicket(ServerLevel world, ChunkPos chunkPos) {
+-        world.getChunkSource().addRegionTicket(TicketType.ENDER_PEARL, chunkPos, 2, chunkPos);
++        if (!world.paperConfig().misc.legacyEnderPearlBehavior) world.getChunkSource().addRegionTicket(TicketType.ENDER_PEARL, chunkPos, 2, chunkPos); // Paper - Allow using old ender pearl behavior
+         return TicketType.ENDER_PEARL.timeout();
+     }
+ 
+diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/server/players/PlayerList.java
++++ b/src/main/java/net/minecraft/server/players/PlayerList.java
+@@ -0,0 +0,0 @@ public abstract class PlayerList {
+         while (iterator.hasNext()) {
+             ThrownEnderpearl entityenderpearl = (ThrownEnderpearl) iterator.next();
+ 
++            // Paper start - Allow using old ender pearl behavior
++            if (!entityenderpearl.level().paperConfig().misc.legacyEnderPearlBehavior) {
+             entityenderpearl.setRemoved(Entity.RemovalReason.UNLOADED_WITH_PLAYER, EntityRemoveEvent.Cause.PLAYER_QUIT); // CraftBukkit - add Bukkit remove cause
++            } else {
++                entityenderpearl.cachedOwner = null;
++            }
++            // Paper end - Allow using old ender pearl behavior
+         }
+ 
+         worldserver.removePlayerImmediately(entityplayer, Entity.RemovalReason.UNLOADED_WITH_PLAYER);
+diff --git a/src/main/java/net/minecraft/world/entity/projectile/ThrownEnderpearl.java b/src/main/java/net/minecraft/world/entity/projectile/ThrownEnderpearl.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/world/entity/projectile/ThrownEnderpearl.java
++++ b/src/main/java/net/minecraft/world/entity/projectile/ThrownEnderpearl.java
+@@ -0,0 +0,0 @@ public class ThrownEnderpearl extends ThrowableItemProjectile {
+         Entity entity = super.teleport(teleportTarget);
+ 
+         if (entity != null) {
+-            entity.placePortalTicket(BlockPos.containing(entity.position()));
++            if (!this.level().paperConfig().misc.legacyEnderPearlBehavior) entity.placePortalTicket(BlockPos.containing(entity.position())); // Paper - Allow using old ender pearl behavior
+         }
+ 
+         return entity;

patches/server/Block-Enderpearl-Travel-Exploit.patch

@@ -0,0 +1,49 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Aikar <aikar@aikar.co>
+Date: Mon, 30 Apr 2018 17:15:26 -0400
+Subject: [PATCH] Block Enderpearl Travel Exploit
+
+Players are able to use alt accounts and enderpearls to travel
+long distances utilizing the pearls in unloaded chunks and loading
+the chunk later when convenient.
+
+This disables that by not saving the thrower when the chunk is unloaded.
+
+This is mainly useful for survival servers that do not allow freeform teleporting.
+
+Note: Currently removed as enderpearls are ticked as long as their owner is online in 1.21.2.
+Might be worth to re-add once an option to disable the above vanilla mechanic is added, to
+fully prevent enderpearl travel exploits.
+
+== AT ==
+public net.minecraft.world.entity.projectile.Projectile ownerUUID
+
+diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
++++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
+@@ -0,0 +0,0 @@ public class ServerLevel extends Level implements ServerEntityGetter, WorldGenLe
+ 
+         public void onTickingEnd(Entity entity) {
+             ServerLevel.this.entityTickList.remove(entity);
++            // Paper start - Reset pearls when they stop being ticked
++            if (ServerLevel.this.paperConfig().fixes.disableUnloadedChunkEnderpearlExploit && ServerLevel.this.paperConfig().misc.legacyEnderPearlBehavior && entity instanceof net.minecraft.world.entity.projectile.ThrownEnderpearl pearl) {
++                pearl.cachedOwner = null;
++                pearl.ownerUUID = null;
++            }
++            // Paper end - Reset pearls when they stop being ticked
+         }
+ 
+         public void onTrackingStart(Entity entity) {
+diff --git a/src/main/java/net/minecraft/world/entity/projectile/Projectile.java b/src/main/java/net/minecraft/world/entity/projectile/Projectile.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/world/entity/projectile/Projectile.java
++++ b/src/main/java/net/minecraft/world/entity/projectile/Projectile.java
+@@ -0,0 +0,0 @@ public abstract class Projectile extends Entity implements TraceableEntity {
+     protected void readAdditionalSaveData(CompoundTag nbt) {
+         if (nbt.hasUUID("Owner")) {
+             this.setOwnerThroughUUID(nbt.getUUID("Owner"));
++            if (this instanceof ThrownEnderpearl && this.level() != null && this.level().paperConfig().fixes.disableUnloadedChunkEnderpearlExploit && this.level().paperConfig().misc.legacyEnderPearlBehavior) { this.ownerUUID = null; } // Paper - Reset pearls when they stop being ticked; Don't store shooter name for pearls to block enderpearl travel exploit
+         }
+ 
+         this.leftOwner = nbt.getBoolean("LeftOwner");

patches/server/Paper-config-files.patch

@@ -1889,7 +1889,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +
 +    public class Fixes extends ConfigurationPart {
 +        public boolean fixItemsMergingThroughWalls = false;
-+        public boolean disableUnloadedChunkEnderpearlExploit = true;
++        public boolean disableUnloadedChunkEnderpearlExploit = false;
 +        public boolean preventTntFromMovingInWater = false;
 +        public boolean splitOverstackedLoot = true;
 +        public IntOr.Disabled fallingBlockHeightNerf = IntOr.Disabled.DISABLED;
@@ -1997,6 +1997,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        public boolean disableSprintInterruptionOnAttack = false;
 +        public int shieldBlockingDelay = 5;
 +        public boolean disableRelativeProjectileVelocity = false;
++        public boolean legacyEnderPearlBehavior = false;
 +
 +        public enum RedstoneImplementation {
 +            VANILLA, EIGENCRAFT, ALTERNATE_CURRENT